W. Ross Ashby (1956) An Introduction to Cybernetics, (Chapman & Hall, London): This classical book is now available online for free from the Principia Cybernetica Electronic Library [Acrobat PDF-Format]. Fischer, M. R. and W. Bartens (Eds., 1999) Zwischen Erfahrung und Beweis - medizinische Entscheidungen und Evidence-based Medicine. Bern, Göttingen, Toronto, Seattle, Verlag Hans Huber. An introduction to medical decision theory [printed, in German only]. David MacKay (2001) Textbook: Information Theory, Inference and Learning Algorithms [Acrobat PDF-Format] Harold C. Sox, Marshal A. Blatt, Michael C. Higgins, Keith I. Marton (1987) Medical Decision Making. Boston, London, Oxford, Singapore, Sydney, Toronto, Wellington, Butterworth-Heinemann. This introduction meets both the needs of medical students and physicians [printed, in English].	Featured Books U. Alon (2006). An Introduction to Systems Biology: Design Principles of Biological Circuits D. A. De Jong (2007). Progress in Biological Cybernetics Research     Journal Club Original Article Deng, B. (2006). "Why is the number of DNA bases 4?" Bull Math Biol. 68 (3): 727-33. Epub 2006 Mar 29. Review Fricke, O., G. Lehmkuhl und E. Schoenau (2006). "The principle of regulation in biology--from bone to eating behavior." Exp Clin Endocrinol Diabetes. 114 (4): 197-203.